* Write barrier support with LVM2/md
@ 2006-09-22 10:44 Martin Lucina
2006-09-22 21:24 ` Chris Wedgwood
0 siblings, 1 reply; 2+ messages in thread
From: Martin Lucina @ 2006-09-22 10:44 UTC (permalink / raw)
To: xfs
Hello,
Having recently upgraded several systems to Linux 2.6.16/2.6.18 I learnt
about the issues with modern drives and write caching. Thanks for the
excellent FAQ entry on this.
Unfortunately it seems that write barriers do not work when using XFS on
top of LVM2 (device-mapper).
Trying an explicit mount with -o barrier gives:
Filesystem "dm-4": Disabling barriers, not supported by the underlying device
Is anyone working on a fix for this? It might be a good idea to add to
the FAQ that write barriers are not supported on dm devices.
-mato
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Write barrier support with LVM2/md
2006-09-22 10:44 Write barrier support with LVM2/md Martin Lucina
@ 2006-09-22 21:24 ` Chris Wedgwood
0 siblings, 0 replies; 2+ messages in thread
From: Chris Wedgwood @ 2006-09-22 21:24 UTC (permalink / raw)
To: Martin Lucina; +Cc: xfs
On Fri, Sep 22, 2006 at 12:44:17PM +0200, Martin Lucina wrote:
> Is anyone working on a fix for this? It might be a good idea to add
> to the FAQ that write barriers are not supported on dm devices.
it's not really an XFS issue, it's that the md/dm/lvm layers don't
support write barriers (and it would in many cases be hard to support
without killing performance).
^ permalink raw reply [flat|nested] 2+ messages in thread
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